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Humus: Quiz


Question 1: ________, which is slowly transformed by white-rot fungi,[18] is one of the main precursors of humus,[19] together with by-products of microbial[20] and animal[21] activity.
Cell wallFungusLigninPlant

Question 2: [7] Physically, it helps the soil retain moisture by increasing micro________,[8] and encourages the formation of good soil structure.
Water contentPorosityPermeability (earth sciences)Hydraulic conductivity

Question 3: This process is at the origin of the formation of the fertile ________ or Terra preta de Indio.
Amazon RainforestTerra pretaAgricultureCarbon

Question 4: In ________, humus refers to any organic matter that has reached a point of stability, where it will break down no further and might, if conditions do not change, remain essentially as it is for centuries, if not millennia.
GeologyEarth scienceSoil sciencePhysical geography

Question 5: [17] Simple proteins, organic acids, starches and sugars break down rapidly, while crude proteins, ________, waxes and resins remain relatively unchanged for longer periods of time.
LipidTrans fatFatFatty acid

Question 6:
Humus, Erosion and Soil salinity are all:
Organic gardening Sustainable agriculture Soil science Organic farming

Question 7: [22] ________ humus (vermicompost) is considered by some to be the best organic manure there is.

Question 8: Humus (origin: 1790–1800; < ________: earth, ground)[1] is degraded organic material in soil, which causes some soil layers to be dark brown or black.
Old LatinVulgar LatinLatinRoman Empire

Question 9:
Humus, Urea and Ammonium nitrate are all:
Organic farming Soil science Organic gardening Soil improvers

Question 10:
Humus, Organic farming and Biodynamic agriculture are all:
Soil science Sustainable agriculture Organic farming Organic gardening


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